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[/] [neorv32/] [trunk/] [sw/] [example/] [blink_led/] [blink_led_in_asm.S] - Rev 72
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.file "blink_led_in_asm.S"
.section .text
.balign 4
.global blink_led_asm
blink_led_asm:
/* base address of GPIO controller's output port is passed as argument (in a0)*/
sw zero, 0(a0) /* clear output port */
li t1, 0 /* initialize counter */
blink_loop:
andi t1, t1, 255 /* apply 8-bit mask */
sw t1, 0(a0) /* output current counter value */
addi t1, t1, 1 /* increment counter */
jal ra, blink_delay /* call delay function */
j blink_loop
blink_delay:
li t2, 0xfffff /* delay time */
blink_delay_loop:
beq t2, zero, blink_delay_end
addi t2, t2, -1
nop
nop
j blink_delay_loop
blink_delay_end:
ret
.end
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